The most common type of meter has clock-type dials as shown below. The meter may have four to six dials. Read the dials from left to right.
If the dial hand is not directly on a number, record the preceding number.
When a hand is directly on a number, always check the dial to the right. If the hand on the right is NOT ON OR PASSED THE ZERO, record the preceding number.

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Glossary

union

The union of two sets A and B is the set containing all the elements of A and B.